<template>
  <div class="article-container">
    <!-- 1. 导航栏 -->
    <van-nav-bar
      class="page-nav-bar"
      left-arrow
      title="黑马头条"
      @click-left="$router.back()"
    ></van-nav-bar>

    <!-- 2. 主体区域 -->
    <div class="main-wrap">
      <!-- 2.1 加载中 -->
      <div v-if="loading" class="loading-wrap">
        <van-loading color="#3296fa" vertical>加载中</van-loading>
      </div>

      <!-- 2.2 加载完成-文章详情 -->
      <div v-else-if="article.title" class="article-detail">
        <h1 class="article-title">{{ article.title }}</h1>
        <van-cell class="user-info" center :border="false">
          <van-image
            class="avatar"
            slot="icon"
            round
            fit="cover"
            :src="article.aut_photo"
          />
          <div slot="title" class="user-name">{{ article.art_id }}</div>
          <div slot="label" class="publish-date">
            {{ article.pubdate | relativeTime }}
          </div>
          <van-button
            class="follow-btn"
            type="info"
            color="#3296fa"
            round
            size="small"
            icon="plus"
            >关注</van-button
          >
        </van-cell>
        <div
          ref="article-content"
          class="article-content markdown-body"
          v-html="article.content"
        ></div>
        <van-divider>正文结束</van-divider>
      </div>

      <!-- 2.3 加载失败：404 -->
      <div v-else-if="is404" class="error-wrap">
        <van-icon name="failure" />
        <p class="text">该资源不存在或已删除！</p>
      </div>

      <!-- 2.4 加载失败：其它未知错误（例如网络原因或服务端异常） -->
      <div v-else class="error-wrap">
        <van-icon name="failure" />
        <p class="text">内容加载失败！</p>
        <van-button class="retry-btn">点击重试</van-button>
      </div>
    </div>

    <!-- 3. 底部区域 -->
    <div class="article-bottom" v-if="article.art_id">
      <van-button class="comment-btn" type="default" round size="small"
        >写评论</van-button
      >
      <van-icon name="comment-o" color="#777" />
      <!-- <van-icon color="#777" name="star-o" /> -->
      <!-- <collectArticle
        :value="article.is_collected"
        @input="article.is_collected = $event"
        :id="id"
      ></collectArticle> -->
      <collectArticle v-model="article.is_collected" :id="id"></collectArticle>
      <!-- <link-article
        :like-count="article.like_count"
        @update:like-count="article.like_count = $event"
        :id="id"
      ></link-article> -->
      <like-article
        :like-count.sync="article.like_count"
        :id="id"
      ></like-article>
      <!-- <van-icon color="#777" name="good-job-o" /> -->
      <van-icon name="share" color="#777777"></van-icon>
    </div>
  </div>
</template>

<script>
import { getArticleById } from "@/api/articles";
import { ImagePreview } from "vant";
import CollectArticle from "@/components/collect-article";
import LikeArticle from "@/components/like-article";

export default {
  name: "ArticleDetail",
  data() {
    return {
      // 第一个变量
      article: {},
      // 第二个变量
      loading: true,
      // 第三个变量
      is404: false,
    };
  },
  created() {
    this.loadArticle();
  },
  props: {
    id: {
      type: [String, Number], // 既可以是数字类型, 也可以是字符串类型
      required: true,
    },
  },
  methods: {
    async loadArticle() {
      try {
        this.loading = true;
        const res = await getArticleById(this.id);
        this.article = res.data;
        // console.log(this.article);
        setTimeout(() => {
          this.previewImage();
        });
      } catch (error) {
        if (error.response && error.response.status === 404) {
          this.is404 = true;
        }
      } finally {
        this.loading = false;
      }
    },
    previewImage() {
      const imgDoms = this.$refs["article-content"].querySelectorAll("img");
      const imgUrls = [];
      imgDoms.forEach((imgDom, index) => {
        imgUrls.push(imgDom.src);
        imgDom.onclick = () => {
          ImagePreview({
            images: imgUrls,
            startPosition: index,
          });
        };
      });
    },
  },
  components: {
    CollectArticle,
    LikeArticle,
  },
};
</script>

<style scoped lang="less">
@import url("./github-markdown.css");

.article-container {
  .main-wrap {
    position: fixed;
    left: 0;
    right: 0;
    top: 92px;
    bottom: 88px;
    overflow-y: scroll;
    background-color: #fff;
  }
  .article-detail {
    .article-title {
      font-size: 40px;
      padding: 50px 32px;
      margin: 0;
      color: #3a3a3a;
    }

    .user-info {
      padding: 0 32px;
      .avatar {
        width: 70px;
        height: 70px;
        margin-right: 17px;
      }
      .van-cell__label {
        margin-top: 0;
      }
      .user-name {
        font-size: 24px;
        color: #3a3a3a;
      }
      .publish-date {
        font-size: 23px;
        color: #b7b7b7;
      }
      .follow-btn {
        width: 170px;
        height: 58px;
      }
    }

    .article-content {
      padding: 55px 32px;
      /deep/ p {
        text-align: justify;
      }
    }
  }

  .loading-wrap {
    padding: 200px 32px;
    display: flex;
    align-items: center;
    justify-content: center;
    background-color: #fff;
  }

  .error-wrap {
    padding: 200px 32px;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    background-color: #fff;
    .van-icon {
      font-size: 122px;
      color: #b4b4b4;
    }
    .text {
      font-size: 30px;
      color: #666666;
      margin: 33px 0 46px;
    }
    .retry-btn {
      width: 280px;
      height: 70px;
      line-height: 70px;
      border: 1px solid #c3c3c3;
      font-size: 30px;
      color: #666666;
    }
  }

  .article-bottom {
    position: fixed;
    left: 0;
    right: 0;
    bottom: 0;
    display: flex;
    justify-content: space-around;
    align-items: center;
    box-sizing: border-box;
    height: 88px;
    border-top: 1px solid #d8d8d8;
    background-color: #fff;
    .comment-btn {
      width: 282px;
      height: 46px;
      border: 2px solid #eeeeee;
      font-size: 30px;
      line-height: 46px;
      color: #a7a7a7;
    }
    .van-icon {
      font-size: 40px;
      .van-info {
        font-size: 16px;
        background-color: #e22829;
      }
    }
  }
}
</style>
